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Seatpost adjustable on the fly? What are those things called & who makes a good one?

What are those things called that let you collapse a seatpost like an office chair? You press a lever and sit and your weight telescopes the seatpost, then when you press the lever with your weight off, a spring pushes the seat back up?

What are those called and who makes a good one? Please help if you can.

I never thought Fiets would be the one to get this question. The Hite-Rite is a bit of an antique; I have one just because I think it's cool, but it's not very functional. It takes a good bit of skill to use while riding, but it looks cool and gets lots of compliments, so I'm keeping it.

The new ones actually do the job pretty well, it's just not a job that really needs to be done, especially for the price.